Depreciation and Amortization by Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Depreciation and Amortization
Depreciation and amortization	$ 20,196	$ 24,421	$ 19,950
Laser Products
Depreciation and Amortization
Depreciation and amortization	6,083	6,481	6,335
Vision Technologies
Depreciation and Amortization
Depreciation and amortization	8,599	13,254	8,808
Precision Motion
Depreciation and Amortization
Depreciation and amortization	2,533	1,943	1,979
Unallocated Corporate and Shared Services
Depreciation and Amortization
Depreciation and amortization	$ 2,981	$ 2,743	$ 2,828